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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c0823d886733b40f69d0fae294d5a844d2ec39e1d83a88f488f50e1cc28f6fe' 
  AND token = 'NV2mN6isjoNunExIbT+Y08GG+tzpDrmscj5zckD2DYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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