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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f90ee38d9cd3eb6159eca0e1052575598ecfd6157317f16378724fbfdc360ee' 
  AND token = 'ZWklhPSKKS4w4KnR235k2kEs3WhXRi9WBVRmxjuIhys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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