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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd82823ed7988dbdaa6a6aa8b1341497b164551d824a13d7fec1dff1f37793a9' 
  AND token = '1ybxHp+DdJswXW/+AXUadAUUeAGgowQxp8JJkk7/FuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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