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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb3d860021d609dfd6fd8fe72ecc85ddf30a79d10e697b76c0ab1176db74c47e' 
  AND token = '/2l5FTvwhDASTeCXgle9U1wJQRWmMhkUBtx+qQePN5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}