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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18d5e1b51f9064edece9b11cb56e7771f477fe4271261128e4aa239e5d12b37d' 
  AND token = 'F0jWnGvc9/l4z6ykHbgh/Ssh8UdZj5tqx2PmwFsyT2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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