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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfbfcaa146c3cacde364f1f934552e2de78404537fa18dd8c6f405d075c4d7c9' 
  AND token = 'CGDzd6CeZRIxY393HTliWDvyqynv7E9NJw7b8GxfpBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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