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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfe0c3abc0a827b1efccf7f384c3773671a51e0c7a453e0c79c316df631a36e5' 
  AND token = 'Ra/jRjVkisFN9dvA6h/puZzaqjJR45qbKnHKdPzxOdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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