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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b363c73c190b250ef1f9fc3c403428a827be2e101c11795a6a1c9e08ca56d19' 
  AND token = 'lmOuJld3dom3dvrHNbax0kPoTzUWSDKbdQIyvTxD5Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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