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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21b73956ae442abfb6b5f73665307cd5b032a7bfc60bff49d63d261b54b03a93' 
  AND token = 'o6lXcYsATOTwuowZ+IyIV2+gk7y41ZO4mO5T0iUyoyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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