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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d38a68e81e3c7e136ca690c9cb90ee3f88cf1533708fe0de6a3c1ce9a3a8c6a' 
  AND token = 'yNKsrJuE8Q8mFiCCfgSTogGEAZaEAnDqGjhl3VrH/BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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