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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '996615d36aca196574d4f511313c4e16647b6ca95dc2e71466408806d9c08144' 
  AND token = 'Rwvo60N0VS/YhQGQKbbvDEKIOCrX8Ys65f58egbKR9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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