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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc7325bbd4780a7c82bb6f2b5b69d59fcfa7b34a0597af02a57f8e573839e89' 
  AND token = 'Me8H88NBbprQo7Axi/MPv5f61Ws7LnXhTP+58Zw4h+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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