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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c274bfe3d61a59769f1ffffa67f71279fce2371e79abb41fcdf8a25aa637434' 
  AND token = 'pdZMp/uxgg+IYS/fgKT1RiC4ShuKfxx+1/Klh89eGCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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