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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad774e142c08a035e3c43248c28a476f2c76bbe3c007d62e8a2882964dec47c4' 
  AND token = '5gYwDc3FFm3btvRE9HqxxHSgOZE2zpYOrdgASlLOR14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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