SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85c7fe862d2a1c6583df4e7fcc0c245502bfe7b1e39bab44ff91bb0ddce8dd51' 
  AND token = 'd2KKs7NBnShS/Dw0w326jtuhK1jOjVwnXAJdpqgMQ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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