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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3355b4775351d39f6c1481d91cd2dd0591718600fb62edd825b5d7612089fe0' 
  AND token = 'PkKIRD8XT/CQMMGZgKtWs8ci9LXMfLEtM4h9jtLsmKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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