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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e93f0a4f9995367020dfc7d9360aa579a4c51126f61951e4ac097ce876e747fb' 
  AND token = '+cBi6lNxYiUqI+qXP4ttm1wRGO9rtqOTUHTjJBOy2Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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