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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53f32ec3f16b1e7c58c6acfe5857a18381621f7769cac8ce992c8ddea6049c2d' 
  AND token = 'khL/lOqi0g5xsp0mVhfkinUCDhSSJf6w/dyt1dc8enw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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