SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba48d02aa4841267f7c67d210f4790c2426035af3c20623ef12e65e7582693e0' 
  AND token = 'DZenb8HC01AKwTX9vkqfRGYEEl8bnIv/+q3z1A8asnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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