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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6be23efc6b40c4ffd3c256998dcaaf256f5714439ad3d25527ae5deac7fa6341' 
  AND token = '8afWn76VN6wHtZtkXsdoNl5mAe8UkHvh1ctWwZPXAZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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