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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17c626e5a9a2d6d8e88d9b5e80bcf20b127badc2d7dcaa972e870801c2a5a3fb' 
  AND token = 'PR/fpvp7pFVvtDZH50gBPwf+y2kRjiKtwU8c0RjnsUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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