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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ad4817375318449fd9b43d9c2a7f93aa534c808113c29b43993a331672b9ac5' 
  AND token = 'he85MB6jAwwwC2No5jncpZDaHe0K+uM5v8ntCl68kLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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