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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65bf29f3fca3165d6da3f70bd0fcffebb53b19c0a1637de29d8f45e581eccc9d' 
  AND token = '7jfEY8N7IBkomam7QxALfnt0dV4eq3S1+xgJfkUwWg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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