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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33873fe77c5e4bd6234c6193fde9179939e82726174233f3071af730f5ae928b' 
  AND token = 'JiL1yqrpm/E5rDcrjAyLr6wyXvPxeUv+2xbUB9XNPRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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