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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaaad7451297ba6c7b052643093810e973b94ee262f1112b61c36e74b5a3b9c5' 
  AND token = 'o/4wZDuuxoiSp+rpm0WK+8t344OUe0m1h3ZZmXT//ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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