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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5ebf2bebbe5303015180402e58f7476b07a31ebaea7d2035562e35526d915e5' 
  AND token = '7mlsxbCjzWUYesqngKzOeEDcAd5OzpHSkNKAdRBOZLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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