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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be200c16ac89f48a5849d169f7e81d63a8e819ed379aac571fa5448861e51fc7' 
  AND token = '6uP9d2VAqNZNIJ74mDgJsMBGSYrsGsPenacjzVk6qq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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