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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8857723849811252c3ef8cf48311c8389c72dcb9f5c53c92fe0f11c920d3a620' 
  AND token = 'fipgiqSFuwHV+FyXm5xzksmacovduv+cNBS7VF47jyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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