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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a07d2a7e53cc7cb2f677b829ab5a5d70c1ff5e22a8e082338a0f4610abac1836' 
  AND token = '6NTnlGx/Kk82sfIgP7qkJwO5Ehpo3Bm7/YtUe+hCtcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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