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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df9131a5f88552fa451871ff1ae8bf4d778d266bf4fd410aa1d5e9cf56c36800' 
  AND token = '0Drp0hOB8zz7C0OIK3wEUZ1kFl2n1FozYpu1CIkd3P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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