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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '639fd26c9d7676df9c3dc3079c9b6dc03f1aed12f98c48aaf8e5ef53ebad8b50' 
  AND token = 'nNe2T9y4aD4LEObMSLxI0PivRpLjyTTeaW9vzshvf+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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