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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97929639a6c93ba7fa14726cdb6a762e8b86c229b227d5aaa01eb46f2e120e32' 
  AND token = 'I9wx/xoSHdnnzPt2Y5ebfZ68hP0rWC2rPFpJ853Zxg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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