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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97a2416c28f41526daa3e0c1b57fb5ed66e2379aadb4e3a34af05692208941bb' 
  AND token = 'qMVkPioA98sPBEGsh9KfBUlrZ54MEEyPO1FxdjbXsZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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