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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0f38b63cfaad8e9a06d06fa18c18960f27434150ce6d09a83e3f948cd49c2a5' 
  AND token = 'SuXBPpB0FGEKaSlMFGzRQ+5aFfP1M0W9OBhAqlwQe3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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