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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd123ffe07885941c9d16ced9bb1fc5a92e9f8cadbf90b2cca56ae8b8a66a719d' 
  AND token = 'uAG3o+rSrQduEcgSXk6i2DZGaIXWDdMoKXAp5pM2l8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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