SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd29959a581dcc083c880b229357b314619c13663e163d3ef22a4cf25927dd7d4' 
  AND token = 'nF4hFHlyzXuu/bHIXpj1MrU0vPYwwqzGz2VeAR1Xom0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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