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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3bf591718e504ccd216b05367ad43585ab6e08765081ba0dbfff482a28438fc' 
  AND token = 'VG9nXLcvnQVOGenMlrRz4Anb+LLsTfXi6eV7nle62Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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