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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '474ed004ddd417df1d889407f4b313d3e290bedf6271a35d103e4b30520eea89' 
  AND token = 'uIP20ItZD+jDrLBXZQNekcWorPrsl7rfFCI/Fpvr2/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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