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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8919e433fd4ce19ebd44b81abe2f7f08ad413c47d802e7ca9d13d5e954500bc0' 
  AND token = 'MtqNT0Y7szYLoGpzFUQZvYSmrclNZjsW91t0U9nQK30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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