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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd971190c4b67346d3db04e959d4dfd1a0172eb8f6edeec3cc76e4c4b70aa3776' 
  AND token = 'IUSa1nMj093matOxMiDt8tEfb5UwFuy4dGElUM2pOko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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