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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b0f07b3ad427a9005c7c6eeb167e72033c900cb9b3b39f07deccbd3e7c8bcd6' 
  AND token = 'T8a6DAz4n5wT0SBnzqZnKjn1xXtFI8Sm6Am5ETerKl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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