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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b392822520807d1e0f035e1e6455f3391ef10e8f6733e360d860ce85c86e637' 
  AND token = 'iFjhp0Kp3fyhCJgYx8bHb9UMlFogj66NX5jWO70Bb+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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