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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '571671312d2388a1dd700a32257db572f30dc3e6c03cb678af9d4865dfdc5e16' 
  AND token = 'NUn2cNtbkLUilnMyRQHAWqmvu5+MBz1vT4IynhzbQOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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