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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82809467db88f374f9f61ac444b01a099acc450a80e214ec8345a5168499c118' 
  AND token = 'KMqsyN7aUuIutbRfEp00IXhbo2fSZmKtSBV0zNdCdlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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