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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ec0cf644729bbbd106e7e9ca83e25b708bc135bd040ad78ebd983008df49f3a' 
  AND token = 'FGmAYJzYEh2pT7QOUmA4xJGF5WpMVJCCh8LC2LuGUaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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