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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f5e6f691c336b90f82b8a1bc566a95970c572299761d0915a55723b4feed7aa' 
  AND token = '102HaocHeN7imkyDf0LiJZw/WUl7qv4QT97ReukT6/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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