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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ee5aaeb93de677a4244e1df24848494fd4e9a1997c8fdb4507778494564babc' 
  AND token = 'Flqx0IDqOXg/u3T8jNiqqz1fJYstpsclDIPy3C2imwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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