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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4f3349c4fa0fedbf2127e26c40ed058c24244b586db7a4da0a8d71eca2de0a0' 
  AND token = 'WixraWEXgt4FQkQiVKkyHnnqcdZclMDkc6fLQ13Ka4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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