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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fb8267dacd3b48c0428a5628640bad9f3316f3eb3042c664772210f4ba5c2d9' 
  AND token = 'b3zZffK/2l1hLIar8KQDthIyxBA46G9HYs0OANiCa4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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