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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2824446067c0af86cc1c9cefa0adca0409f6af87af6fe523b18c501caa545097' 
  AND token = 'iC9tlAxjPD4lCoC36OvRbYHNiHY9scm2BT3LZfIqU/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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