SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97e875b0e5b5823ea59d4fad8c0ffca69b2527d983237157dcd4f5267dce6cdd' 
  AND token = 'NEGdwHJAhJvVjvqUeZrDDMfMUtI+8e+zdrmY6BMTZGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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