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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '379701dfc983e8530ccabdc4fca0e0061fef67ab6681478069989dfc9175cfce' 
  AND token = 'jpAyYFNHpYOYHeNf6DuB/sSDpwFdYyyndodFKS7G+xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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