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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bd42e4d45f43bfe87bb8e8a947f3bda0a3d2b68c9f8f9046768d46b154bc3e5' 
  AND token = 'hGkOzE2qxffOvOiU6cAL9lvJP5WKxfXOhtR1/A8/3jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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