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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efd7b356748eb8efd374251dcc80afd23f3b249e7dde46043a55c663893e4725' 
  AND token = '9ReVw0na6wphqS0zPf/dZy8C4aoPjeEfZa0CNxax4D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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