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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36a608c9e0420c5aa894cdce3439d99e17aede60bbdca7773fc7c99e1551bcf1' 
  AND token = 'YJ2uMqC4IZVtgN6NCSAHLwzT2LSgcWenUHEkDKv332o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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