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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ccffbdd2924fed274ad301709e2ac1b2a7b8e535dbcf637a7b9c28b7c4ef4d7' 
  AND token = '4Upd3eLtJ0pIaycyy5sP2fif1NIkJw39KpGUhhZesDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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