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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '966955ae814d7b20fab1672aa57fdeccff8175f2420c0ea9741cd84a70c414d6' 
  AND token = 'Wf8XXOrmy5anZnXiWrMacCt1ACQugzzrOUbeaby7upA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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