SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1982c9361ede8bdac977a18af2ea8d293506f7f16b96947c80d1023b4adc23c4' 
  AND token = 'koBqfo2dbhwmaB+c2rKGTTDZR7YP4zbGakYlz4swFKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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