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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b6aa1f794dad6c9743d7a50811b86ca5099d57e975220e377bd91afe42f6e84' 
  AND token = 'vXXZoQdCRnr7hTD1UqKex69UlTEbW3aDuTwt0LLFlMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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