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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc19d1267ec821fcfc4566975f5633235666e6697782f77beb77a7b2c85ac864' 
  AND token = 'dF3m0jy9F6g9lMI4MkHsY6IqDtyBJwMTCOB4PWYITP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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