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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '471f56349721a1ef590f6766c7444649db6da394d227bc13bebe79a02f2828cd' 
  AND token = 'nT0UuEe3AaNySytrGz3pXZpnpYWpdK0YaUCnvL7VB5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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