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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89b8245c4653ebe2edc27c2e3cc9f22744f0b6f4afcfbfcebce0fb1fd6630cf8' 
  AND token = 'iYkT7FB3Lpuq+Le7iQOZ4m6k/+EPW8VQctGxoSraZn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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