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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dd42501a966eae2a87433ab4227cbfcf57b686577677f87bc7d689fd8763912' 
  AND token = '6t5Q1tRSRUssmmo7Z3nBCKDfVMcPuNySjuISwMEXJjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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