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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2f3747e367d7365aaa0a54acfa0ab56b1ac601cdcfd8036369ebd82a8286da8' 
  AND token = 'IZLgo52RQB+amWeMvX1jD0kdrYsafmvAnOUqP52lXkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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